Date: Fri, 4 Jan 2013 16:24:20 +0100 From: Fleuriot Damien <ml@my.gd> To: O. Hartmann <ohartman@zedat.fu-berlin.de> Cc: Garrett Cooper <yanegomi@gmail.com>, Current FreeBSD <freebsd-current@freebsd.org> Subject: Re: ZFS/RAIDZ and SAMBA: abyssimal performance Message-ID: <23BF8538-FB5A-4432-A4E1-721B5F566CA2@my.gd> In-Reply-To: <50E6F2FC.3060903@zedat.fu-berlin.de> References: <50E6DE91.7010404@zedat.fu-berlin.de> <1ADC2ECB-70FF-4DDD-9D62-16E2EEECDD8B@my.gd> <CAGH67wTeF8dxHFCF53mmAmZzbGf47SQy4yoH58L1gibbUs1tPA@mail.gmail.com> <50E6F2FC.3060903@zedat.fu-berlin.de>
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On Jan 4, 2013, at 4:19 PM, O. Hartmann <ohartman@zedat.fu-berlin.de> = wrote: > Am 01/04/13 15:45, schrieb Garrett Cooper: >> On Fri, Jan 4, 2013 at 6:06 AM, Fleuriot Damien <ml@my.gd> wrote: >>=20 >> ... >>=20 >>> And this is under [global] in /usr/local/etc/smb.conf: >>> min receivefile size =3D 16384 >>> aio read size =3D 16384 >>> aio write size =3D 16384 >>> aio write behind =3D yes >>=20 >> These are still pretty low, depending on what your networking/disk >> setup is like; my important performance settings are: >>=20 >> socket options =3D SO_RCVBUF=3D64240 SO_SNDBUF=3D64240 = TCP_NODELAY >> IPTOS_LOWDELAY IPTOS_THROUGHPUT >> write cache size =3D 65536 >> aio read size =3D 65536 >> aio write size =3D 65536 >> directory name cache size =3D 0 >>=20 >> HTH, >> -Garrett > Well, now I have peak values ~ 120 MB/s when copying. I applied = Fleuriot > Damien's values to /boot/loader.conf and yours to the smb.conf. > Somewhere in the handbook this should be documented! it is to much > efford to get SAMBA working properly with ZFS, if the tricks and > problems are so widespread over several architectural aspects of the = system. >=20 > It could save a lot of time for adminsitartors and those which try > FreeBSD as a serving system instead of Linux. >=20 > Just for the record. I feel a bit confused about all the tricks and > tweak now "published" for ZFS, its magic L2ARC, the kernel_vmem = wizzardy > thingis. The ZFS Wiki seems to be a bit outdated and confusing, it = would > be a great deal if all these things could be lined up a s a primer = with > a bit more explanations than "put this number there". >=20 > And by the way, it is like changing from hell to heaven having now ~ = 100 > MB/s throughput compared to ~1/500! >=20 > Thanks a lot, > Oliver >=20 The problem, Oliver, is that these values are system dependant. Notice how Garret replied that these values are a bit low (and they = might be indeed !). However, while you have 16gb RAM, my ZFS NAS only has 4gb. Basically and as Jeremy Chadwick pointed out at the time, there is no = one set of correct values for 100% of the population. One has to adjust them step by step and decide what is best for them. @garret: I'll try with the values you posted, although I get = 90-120mbytes/s most of the time so I pretty much saturate my 1gbs link.
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